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Merge branch 'media_fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[cris-mirror.git] / net / bridge / br_multicast.c
blobf701a21acb340108f51627ebd10d60b634d0a946
1 /*
2 * Bridge multicast support.
3 *
4 * Copyright (c) 2010 Herbert Xu <herbert@gondor.apana.org.au>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13 #include <linux/err.h>
14 #include <linux/if_ether.h>
15 #include <linux/igmp.h>
16 #include <linux/jhash.h>
17 #include <linux/kernel.h>
18 #include <linux/log2.h>
19 #include <linux/netdevice.h>
20 #include <linux/netfilter_bridge.h>
21 #include <linux/random.h>
22 #include <linux/rculist.h>
23 #include <linux/skbuff.h>
24 #include <linux/slab.h>
25 #include <linux/timer.h>
26 #include <net/ip.h>
27 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
28 #include <net/ipv6.h>
29 #include <net/mld.h>
30 #include <net/addrconf.h>
31 #include <net/ip6_checksum.h>
32 #endif
33
34 #include "br_private.h"
35
36 #define mlock_dereference(X, br) \
37 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
38
39 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
40 static inline int ipv6_is_local_multicast(const struct in6_addr *addr)
41 {
42 if (ipv6_addr_is_multicast(addr) &&
43 IPV6_ADDR_MC_SCOPE(addr) <= IPV6_ADDR_SCOPE_LINKLOCAL)
44 return 1;
45 return 0;
46 }
47 #endif
48
49 static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
50 {
51 if (a->proto != b->proto)
52 return 0;
53 switch (a->proto) {
54 case htons(ETH_P_IP):
55 return a->u.ip4 == b->u.ip4;
56 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
57 case htons(ETH_P_IPV6):
58 return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
59 #endif
60 }
61 return 0;
62 }
63
64 static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
65 {
66 return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
67 }
68
69 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
70 static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
71 const struct in6_addr *ip)
72 {
73 return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
74 }
75 #endif
76
77 static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
78 struct br_ip *ip)
79 {
80 switch (ip->proto) {
81 case htons(ETH_P_IP):
82 return __br_ip4_hash(mdb, ip->u.ip4);
83 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
84 case htons(ETH_P_IPV6):
85 return __br_ip6_hash(mdb, &ip->u.ip6);
86 #endif
87 }
88 return 0;
89 }
90
91 static struct net_bridge_mdb_entry *__br_mdb_ip_get(
92 struct net_bridge_mdb_htable *mdb, struct br_ip *dst, int hash)
93 {
94 struct net_bridge_mdb_entry *mp;
95 struct hlist_node *p;
96
97 hlist_for_each_entry_rcu(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
98 if (br_ip_equal(&mp->addr, dst))
99 return mp;
100 }
101
102 return NULL;
103 }
104
105 static struct net_bridge_mdb_entry *br_mdb_ip_get(
106 struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
107 {
108 if (!mdb)
109 return NULL;
110
111 return __br_mdb_ip_get(mdb, dst, br_ip_hash(mdb, dst));
112 }
113
114 static struct net_bridge_mdb_entry *br_mdb_ip4_get(
115 struct net_bridge_mdb_htable *mdb, __be32 dst)
116 {
117 struct br_ip br_dst;
118
119 br_dst.u.ip4 = dst;
120 br_dst.proto = htons(ETH_P_IP);
121
122 return br_mdb_ip_get(mdb, &br_dst);
123 }
124
125 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
126 static struct net_bridge_mdb_entry *br_mdb_ip6_get(
127 struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
128 {
129 struct br_ip br_dst;
130
131 ipv6_addr_copy(&br_dst.u.ip6, dst);
132 br_dst.proto = htons(ETH_P_IPV6);
133
134 return br_mdb_ip_get(mdb, &br_dst);
135 }
136 #endif
137
138 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
139 struct sk_buff *skb)
140 {
141 struct net_bridge_mdb_htable *mdb = rcu_dereference(br->mdb);
142 struct br_ip ip;
143
144 if (br->multicast_disabled)
145 return NULL;
146
147 if (BR_INPUT_SKB_CB(skb)->igmp)
148 return NULL;
149
150 ip.proto = skb->protocol;
151
152 switch (skb->protocol) {
153 case htons(ETH_P_IP):
154 ip.u.ip4 = ip_hdr(skb)->daddr;
155 break;
156 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
157 case htons(ETH_P_IPV6):
158 ipv6_addr_copy(&ip.u.ip6, &ipv6_hdr(skb)->daddr);
159 break;
160 #endif
161 default:
162 return NULL;
163 }
164
165 return br_mdb_ip_get(mdb, &ip);
166 }
167
168 static void br_mdb_free(struct rcu_head *head)
169 {
170 struct net_bridge_mdb_htable *mdb =
171 container_of(head, struct net_bridge_mdb_htable, rcu);
172 struct net_bridge_mdb_htable *old = mdb->old;
173
174 mdb->old = NULL;
175 kfree(old->mhash);
176 kfree(old);
177 }
178
179 static int br_mdb_copy(struct net_bridge_mdb_htable *new,
180 struct net_bridge_mdb_htable *old,
181 int elasticity)
182 {
183 struct net_bridge_mdb_entry *mp;
184 struct hlist_node *p;
185 int maxlen;
186 int len;
187 int i;
188
189 for (i = 0; i < old->max; i++)
190 hlist_for_each_entry(mp, p, &old->mhash[i], hlist[old->ver])
191 hlist_add_head(&mp->hlist[new->ver],
192 &new->mhash[br_ip_hash(new, &mp->addr)]);
193
194 if (!elasticity)
195 return 0;
196
197 maxlen = 0;
198 for (i = 0; i < new->max; i++) {
199 len = 0;
200 hlist_for_each_entry(mp, p, &new->mhash[i], hlist[new->ver])
201 len++;
202 if (len > maxlen)
203 maxlen = len;
204 }
205
206 return maxlen > elasticity ? -EINVAL : 0;
207 }
208
209 static void br_multicast_free_pg(struct rcu_head *head)
210 {
211 struct net_bridge_port_group *p =
212 container_of(head, struct net_bridge_port_group, rcu);
213
214 kfree(p);
215 }
216
217 static void br_multicast_free_group(struct rcu_head *head)
218 {
219 struct net_bridge_mdb_entry *mp =
220 container_of(head, struct net_bridge_mdb_entry, rcu);
221
222 kfree(mp);
223 }
224
225 static void br_multicast_group_expired(unsigned long data)
226 {
227 struct net_bridge_mdb_entry *mp = (void *)data;
228 struct net_bridge *br = mp->br;
229 struct net_bridge_mdb_htable *mdb;
230
231 spin_lock(&br->multicast_lock);
232 if (!netif_running(br->dev) || timer_pending(&mp->timer))
233 goto out;
234
235 if (!hlist_unhashed(&mp->mglist))
236 hlist_del_init(&mp->mglist);
237
238 if (mp->ports)
239 goto out;
240
241 mdb = mlock_dereference(br->mdb, br);
242
243 hlist_del_rcu(&mp->hlist[mdb->ver]);
244 mdb->size--;
245
246 del_timer(&mp->query_timer);
247 call_rcu_bh(&mp->rcu, br_multicast_free_group);
248
249 out:
250 spin_unlock(&br->multicast_lock);
251 }
252
253 static void br_multicast_del_pg(struct net_bridge *br,
254 struct net_bridge_port_group *pg)
255 {
256 struct net_bridge_mdb_htable *mdb;
257 struct net_bridge_mdb_entry *mp;
258 struct net_bridge_port_group *p;
259 struct net_bridge_port_group __rcu **pp;
260
261 mdb = mlock_dereference(br->mdb, br);
262
263 mp = br_mdb_ip_get(mdb, &pg->addr);
264 if (WARN_ON(!mp))
265 return;
266
267 for (pp = &mp->ports;
268 (p = mlock_dereference(*pp, br)) != NULL;
269 pp = &p->next) {
270 if (p != pg)
271 continue;
272
273 rcu_assign_pointer(*pp, p->next);
274 hlist_del_init(&p->mglist);
275 del_timer(&p->timer);
276 del_timer(&p->query_timer);
277 call_rcu_bh(&p->rcu, br_multicast_free_pg);
278
279 if (!mp->ports && hlist_unhashed(&mp->mglist) &&
280 netif_running(br->dev))
281 mod_timer(&mp->timer, jiffies);
282
283 return;
284 }
285
286 WARN_ON(1);
287 }
288
289 static void br_multicast_port_group_expired(unsigned long data)
290 {
291 struct net_bridge_port_group *pg = (void *)data;
292 struct net_bridge *br = pg->port->br;
293
294 spin_lock(&br->multicast_lock);
295 if (!netif_running(br->dev) || timer_pending(&pg->timer) ||
296 hlist_unhashed(&pg->mglist))
297 goto out;
298
299 br_multicast_del_pg(br, pg);
300
301 out:
302 spin_unlock(&br->multicast_lock);
303 }
304
305 static int br_mdb_rehash(struct net_bridge_mdb_htable __rcu **mdbp, int max,
306 int elasticity)
307 {
308 struct net_bridge_mdb_htable *old = rcu_dereference_protected(*mdbp, 1);
309 struct net_bridge_mdb_htable *mdb;
310 int err;
311
312 mdb = kmalloc(sizeof(*mdb), GFP_ATOMIC);
313 if (!mdb)
314 return -ENOMEM;
315
316 mdb->max = max;
317 mdb->old = old;
318
319 mdb->mhash = kzalloc(max * sizeof(*mdb->mhash), GFP_ATOMIC);
320 if (!mdb->mhash) {
321 kfree(mdb);
322 return -ENOMEM;
323 }
324
325 mdb->size = old ? old->size : 0;
326 mdb->ver = old ? old->ver ^ 1 : 0;
327
328 if (!old || elasticity)
329 get_random_bytes(&mdb->secret, sizeof(mdb->secret));
330 else
331 mdb->secret = old->secret;
332
333 if (!old)
334 goto out;
335
336 err = br_mdb_copy(mdb, old, elasticity);
337 if (err) {
338 kfree(mdb->mhash);
339 kfree(mdb);
340 return err;
341 }
342
343 call_rcu_bh(&mdb->rcu, br_mdb_free);
344
345 out:
346 rcu_assign_pointer(*mdbp, mdb);
347
348 return 0;
349 }
350
351 static struct sk_buff *br_ip4_multicast_alloc_query(struct net_bridge *br,
352 __be32 group)
353 {
354 struct sk_buff *skb;
355 struct igmphdr *ih;
356 struct ethhdr *eth;
357 struct iphdr *iph;
358
359 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*iph) +
360 sizeof(*ih) + 4);
361 if (!skb)
362 goto out;
363
364 skb->protocol = htons(ETH_P_IP);
365
366 skb_reset_mac_header(skb);
367 eth = eth_hdr(skb);
368
369 memcpy(eth->h_source, br->dev->dev_addr, 6);
370 eth->h_dest[0] = 1;
371 eth->h_dest[1] = 0;
372 eth->h_dest[2] = 0x5e;
373 eth->h_dest[3] = 0;
374 eth->h_dest[4] = 0;
375 eth->h_dest[5] = 1;
376 eth->h_proto = htons(ETH_P_IP);
377 skb_put(skb, sizeof(*eth));
378
379 skb_set_network_header(skb, skb->len);
380 iph = ip_hdr(skb);
381
382 iph->version = 4;
383 iph->ihl = 6;
384 iph->tos = 0xc0;
385 iph->tot_len = htons(sizeof(*iph) + sizeof(*ih) + 4);
386 iph->id = 0;
387 iph->frag_off = htons(IP_DF);
388 iph->ttl = 1;
389 iph->protocol = IPPROTO_IGMP;
390 iph->saddr = 0;
391 iph->daddr = htonl(INADDR_ALLHOSTS_GROUP);
392 ((u8 *)&iph[1])[0] = IPOPT_RA;
393 ((u8 *)&iph[1])[1] = 4;
394 ((u8 *)&iph[1])[2] = 0;
395 ((u8 *)&iph[1])[3] = 0;
396 ip_send_check(iph);
397 skb_put(skb, 24);
398
399 skb_set_transport_header(skb, skb->len);
400 ih = igmp_hdr(skb);
401 ih->type = IGMP_HOST_MEMBERSHIP_QUERY;
402 ih->code = (group ? br->multicast_last_member_interval :
403 br->multicast_query_response_interval) /
404 (HZ / IGMP_TIMER_SCALE);
405 ih->group = group;
406 ih->csum = 0;
407 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
408 skb_put(skb, sizeof(*ih));
409
410 __skb_pull(skb, sizeof(*eth));
411
412 out:
413 return skb;
414 }
415
416 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
417 static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
418 struct in6_addr *group)
419 {
420 struct sk_buff *skb;
421 struct ipv6hdr *ip6h;
422 struct mld_msg *mldq;
423 struct ethhdr *eth;
424 u8 *hopopt;
425 unsigned long interval;
426
427 skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
428 8 + sizeof(*mldq));
429 if (!skb)
430 goto out;
431
432 skb->protocol = htons(ETH_P_IPV6);
433
434 /* Ethernet header */
435 skb_reset_mac_header(skb);
436 eth = eth_hdr(skb);
437
438 memcpy(eth->h_source, br->dev->dev_addr, 6);
439 ipv6_eth_mc_map(group, eth->h_dest);
440 eth->h_proto = htons(ETH_P_IPV6);
441 skb_put(skb, sizeof(*eth));
442
443 /* IPv6 header + HbH option */
444 skb_set_network_header(skb, skb->len);
445 ip6h = ipv6_hdr(skb);
446
447 *(__force __be32 *)ip6h = htonl(0x60000000);
448 ip6h->payload_len = htons(8 + sizeof(*mldq));
449 ip6h->nexthdr = IPPROTO_HOPOPTS;
450 ip6h->hop_limit = 1;
451 ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0);
452 ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
453
454 hopopt = (u8 *)(ip6h + 1);
455 hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
456 hopopt[1] = 0; /* length of HbH */
457 hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
458 hopopt[3] = 2; /* Length of RA Option */
459 hopopt[4] = 0; /* Type = 0x0000 (MLD) */
460 hopopt[5] = 0;
461 hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */
462 hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */
463
464 skb_put(skb, sizeof(*ip6h) + 8);
465
466 /* ICMPv6 */
467 skb_set_transport_header(skb, skb->len);
468 mldq = (struct mld_msg *) icmp6_hdr(skb);
469
470 interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
471 br->multicast_query_response_interval;
472
473 mldq->mld_type = ICMPV6_MGM_QUERY;
474 mldq->mld_code = 0;
475 mldq->mld_cksum = 0;
476 mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
477 mldq->mld_reserved = 0;
478 ipv6_addr_copy(&mldq->mld_mca, group);
479
480 /* checksum */
481 mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
482 sizeof(*mldq), IPPROTO_ICMPV6,
483 csum_partial(mldq,
484 sizeof(*mldq), 0));
485 skb_put(skb, sizeof(*mldq));
486
487 __skb_pull(skb, sizeof(*eth));
488
489 out:
490 return skb;
491 }
492 #endif
493
494 static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
495 struct br_ip *addr)
496 {
497 switch (addr->proto) {
498 case htons(ETH_P_IP):
499 return br_ip4_multicast_alloc_query(br, addr->u.ip4);
500 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
501 case htons(ETH_P_IPV6):
502 return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
503 #endif
504 }
505 return NULL;
506 }
507
508 static void br_multicast_send_group_query(struct net_bridge_mdb_entry *mp)
509 {
510 struct net_bridge *br = mp->br;
511 struct sk_buff *skb;
512
513 skb = br_multicast_alloc_query(br, &mp->addr);
514 if (!skb)
515 goto timer;
516
517 netif_rx(skb);
518
519 timer:
520 if (++mp->queries_sent < br->multicast_last_member_count)
521 mod_timer(&mp->query_timer,
522 jiffies + br->multicast_last_member_interval);
523 }
524
525 static void br_multicast_group_query_expired(unsigned long data)
526 {
527 struct net_bridge_mdb_entry *mp = (void *)data;
528 struct net_bridge *br = mp->br;
529
530 spin_lock(&br->multicast_lock);
531 if (!netif_running(br->dev) || hlist_unhashed(&mp->mglist) ||
532 mp->queries_sent >= br->multicast_last_member_count)
533 goto out;
534
535 br_multicast_send_group_query(mp);
536
537 out:
538 spin_unlock(&br->multicast_lock);
539 }
540
541 static void br_multicast_send_port_group_query(struct net_bridge_port_group *pg)
542 {
543 struct net_bridge_port *port = pg->port;
544 struct net_bridge *br = port->br;
545 struct sk_buff *skb;
546
547 skb = br_multicast_alloc_query(br, &pg->addr);
548 if (!skb)
549 goto timer;
550
551 br_deliver(port, skb);
552
553 timer:
554 if (++pg->queries_sent < br->multicast_last_member_count)
555 mod_timer(&pg->query_timer,
556 jiffies + br->multicast_last_member_interval);
557 }
558
559 static void br_multicast_port_group_query_expired(unsigned long data)
560 {
561 struct net_bridge_port_group *pg = (void *)data;
562 struct net_bridge_port *port = pg->port;
563 struct net_bridge *br = port->br;
564
565 spin_lock(&br->multicast_lock);
566 if (!netif_running(br->dev) || hlist_unhashed(&pg->mglist) ||
567 pg->queries_sent >= br->multicast_last_member_count)
568 goto out;
569
570 br_multicast_send_port_group_query(pg);
571
572 out:
573 spin_unlock(&br->multicast_lock);
574 }
575
576 static struct net_bridge_mdb_entry *br_multicast_get_group(
577 struct net_bridge *br, struct net_bridge_port *port,
578 struct br_ip *group, int hash)
579 {
580 struct net_bridge_mdb_htable *mdb;
581 struct net_bridge_mdb_entry *mp;
582 struct hlist_node *p;
583 unsigned count = 0;
584 unsigned max;
585 int elasticity;
586 int err;
587
588 mdb = rcu_dereference_protected(br->mdb, 1);
589 hlist_for_each_entry(mp, p, &mdb->mhash[hash], hlist[mdb->ver]) {
590 count++;
591 if (unlikely(br_ip_equal(group, &mp->addr)))
592 return mp;
593 }
594
595 elasticity = 0;
596 max = mdb->max;
597
598 if (unlikely(count > br->hash_elasticity && count)) {
599 if (net_ratelimit())
600 br_info(br, "Multicast hash table "
601 "chain limit reached: %s\n",
602 port ? port->dev->name : br->dev->name);
603
604 elasticity = br->hash_elasticity;
605 }
606
607 if (mdb->size >= max) {
608 max *= 2;
609 if (unlikely(max >= br->hash_max)) {
610 br_warn(br, "Multicast hash table maximum "
611 "reached, disabling snooping: %s, %d\n",
612 port ? port->dev->name : br->dev->name, max);
613 err = -E2BIG;
614 disable:
615 br->multicast_disabled = 1;
616 goto err;
617 }
618 }
619
620 if (max > mdb->max || elasticity) {
621 if (mdb->old) {
622 if (net_ratelimit())
623 br_info(br, "Multicast hash table "
624 "on fire: %s\n",
625 port ? port->dev->name : br->dev->name);
626 err = -EEXIST;
627 goto err;
628 }
629
630 err = br_mdb_rehash(&br->mdb, max, elasticity);
631 if (err) {
632 br_warn(br, "Cannot rehash multicast "
633 "hash table, disabling snooping: %s, %d, %d\n",
634 port ? port->dev->name : br->dev->name,
635 mdb->size, err);
636 goto disable;
637 }
638
639 err = -EAGAIN;
640 goto err;
641 }
642
643 return NULL;
644
645 err:
646 mp = ERR_PTR(err);
647 return mp;
648 }
649
650 static struct net_bridge_mdb_entry *br_multicast_new_group(
651 struct net_bridge *br, struct net_bridge_port *port,
652 struct br_ip *group)
653 {
654 struct net_bridge_mdb_htable *mdb;
655 struct net_bridge_mdb_entry *mp;
656 int hash;
657 int err;
658
659 mdb = rcu_dereference_protected(br->mdb, 1);
660 if (!mdb) {
661 err = br_mdb_rehash(&br->mdb, BR_HASH_SIZE, 0);
662 if (err)
663 return ERR_PTR(err);
664 goto rehash;
665 }
666
667 hash = br_ip_hash(mdb, group);
668 mp = br_multicast_get_group(br, port, group, hash);
669 switch (PTR_ERR(mp)) {
670 case 0:
671 break;
672
673 case -EAGAIN:
674 rehash:
675 mdb = rcu_dereference_protected(br->mdb, 1);
676 hash = br_ip_hash(mdb, group);
677 break;
678
679 default:
680 goto out;
681 }
682
683 mp = kzalloc(sizeof(*mp), GFP_ATOMIC);
684 if (unlikely(!mp))
685 return ERR_PTR(-ENOMEM);
686
687 mp->br = br;
688 mp->addr = *group;
689 setup_timer(&mp->timer, br_multicast_group_expired,
690 (unsigned long)mp);
691 setup_timer(&mp->query_timer, br_multicast_group_query_expired,
692 (unsigned long)mp);
693
694 hlist_add_head_rcu(&mp->hlist[mdb->ver], &mdb->mhash[hash]);
695 mdb->size++;
696
697 out:
698 return mp;
699 }
700
701 static int br_multicast_add_group(struct net_bridge *br,
702 struct net_bridge_port *port,
703 struct br_ip *group)
704 {
705 struct net_bridge_mdb_entry *mp;
706 struct net_bridge_port_group *p;
707 struct net_bridge_port_group __rcu **pp;
708 unsigned long now = jiffies;
709 int err;
710
711 spin_lock(&br->multicast_lock);
712 if (!netif_running(br->dev) ||
713 (port && port->state == BR_STATE_DISABLED))
714 goto out;
715
716 mp = br_multicast_new_group(br, port, group);
717 err = PTR_ERR(mp);
718 if (IS_ERR(mp))
719 goto err;
720
721 if (!port) {
722 hlist_add_head(&mp->mglist, &br->mglist);
723 mod_timer(&mp->timer, now + br->multicast_membership_interval);
724 goto out;
725 }
726
727 for (pp = &mp->ports;
728 (p = mlock_dereference(*pp, br)) != NULL;
729 pp = &p->next) {
730 if (p->port == port)
731 goto found;
732 if ((unsigned long)p->port < (unsigned long)port)
733 break;
734 }
735
736 p = kzalloc(sizeof(*p), GFP_ATOMIC);
737 err = -ENOMEM;
738 if (unlikely(!p))
739 goto err;
740
741 p->addr = *group;
742 p->port = port;
743 p->next = *pp;
744 hlist_add_head(&p->mglist, &port->mglist);
745 setup_timer(&p->timer, br_multicast_port_group_expired,
746 (unsigned long)p);
747 setup_timer(&p->query_timer, br_multicast_port_group_query_expired,
748 (unsigned long)p);
749
750 rcu_assign_pointer(*pp, p);
751
752 found:
753 mod_timer(&p->timer, now + br->multicast_membership_interval);
754 out:
755 err = 0;
756
757 err:
758 spin_unlock(&br->multicast_lock);
759 return err;
760 }
761
762 static int br_ip4_multicast_add_group(struct net_bridge *br,
763 struct net_bridge_port *port,
764 __be32 group)
765 {
766 struct br_ip br_group;
767
768 if (ipv4_is_local_multicast(group))
769 return 0;
770
771 br_group.u.ip4 = group;
772 br_group.proto = htons(ETH_P_IP);
773
774 return br_multicast_add_group(br, port, &br_group);
775 }
776
777 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
778 static int br_ip6_multicast_add_group(struct net_bridge *br,
779 struct net_bridge_port *port,
780 const struct in6_addr *group)
781 {
782 struct br_ip br_group;
783
784 if (ipv6_is_local_multicast(group))
785 return 0;
786
787 ipv6_addr_copy(&br_group.u.ip6, group);
788 br_group.proto = htons(ETH_P_IP);
789
790 return br_multicast_add_group(br, port, &br_group);
791 }
792 #endif
793
794 static void br_multicast_router_expired(unsigned long data)
795 {
796 struct net_bridge_port *port = (void *)data;
797 struct net_bridge *br = port->br;
798
799 spin_lock(&br->multicast_lock);
800 if (port->multicast_router != 1 ||
801 timer_pending(&port->multicast_router_timer) ||
802 hlist_unhashed(&port->rlist))
803 goto out;
804
805 hlist_del_init_rcu(&port->rlist);
806
807 out:
808 spin_unlock(&br->multicast_lock);
809 }
810
811 static void br_multicast_local_router_expired(unsigned long data)
812 {
813 }
814
815 static void __br_multicast_send_query(struct net_bridge *br,
816 struct net_bridge_port *port,
817 struct br_ip *ip)
818 {
819 struct sk_buff *skb;
820
821 skb = br_multicast_alloc_query(br, ip);
822 if (!skb)
823 return;
824
825 if (port) {
826 __skb_push(skb, sizeof(struct ethhdr));
827 skb->dev = port->dev;
828 NF_HOOK(NFPROTO_BRIDGE, NF_BR_LOCAL_OUT, skb, NULL, skb->dev,
829 dev_queue_xmit);
830 } else
831 netif_rx(skb);
832 }
833
834 static void br_multicast_send_query(struct net_bridge *br,
835 struct net_bridge_port *port, u32 sent)
836 {
837 unsigned long time;
838 struct br_ip br_group;
839
840 if (!netif_running(br->dev) || br->multicast_disabled ||
841 timer_pending(&br->multicast_querier_timer))
842 return;
843
844 memset(&br_group.u, 0, sizeof(br_group.u));
845
846 br_group.proto = htons(ETH_P_IP);
847 __br_multicast_send_query(br, port, &br_group);
848
849 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
850 br_group.proto = htons(ETH_P_IPV6);
851 __br_multicast_send_query(br, port, &br_group);
852 #endif
853
854 time = jiffies;
855 time += sent < br->multicast_startup_query_count ?
856 br->multicast_startup_query_interval :
857 br->multicast_query_interval;
858 mod_timer(port ? &port->multicast_query_timer :
859 &br->multicast_query_timer, time);
860 }
861
862 static void br_multicast_port_query_expired(unsigned long data)
863 {
864 struct net_bridge_port *port = (void *)data;
865 struct net_bridge *br = port->br;
866
867 spin_lock(&br->multicast_lock);
868 if (port->state == BR_STATE_DISABLED ||
869 port->state == BR_STATE_BLOCKING)
870 goto out;
871
872 if (port->multicast_startup_queries_sent <
873 br->multicast_startup_query_count)
874 port->multicast_startup_queries_sent++;
875
876 br_multicast_send_query(port->br, port,
877 port->multicast_startup_queries_sent);
878
879 out:
880 spin_unlock(&br->multicast_lock);
881 }
882
883 void br_multicast_add_port(struct net_bridge_port *port)
884 {
885 port->multicast_router = 1;
886
887 setup_timer(&port->multicast_router_timer, br_multicast_router_expired,
888 (unsigned long)port);
889 setup_timer(&port->multicast_query_timer,
890 br_multicast_port_query_expired, (unsigned long)port);
891 }
892
893 void br_multicast_del_port(struct net_bridge_port *port)
894 {
895 del_timer_sync(&port->multicast_router_timer);
896 }
897
898 static void __br_multicast_enable_port(struct net_bridge_port *port)
899 {
900 port->multicast_startup_queries_sent = 0;
901
902 if (try_to_del_timer_sync(&port->multicast_query_timer) >= 0 ||
903 del_timer(&port->multicast_query_timer))
904 mod_timer(&port->multicast_query_timer, jiffies);
905 }
906
907 void br_multicast_enable_port(struct net_bridge_port *port)
908 {
909 struct net_bridge *br = port->br;
910
911 spin_lock(&br->multicast_lock);
912 if (br->multicast_disabled || !netif_running(br->dev))
913 goto out;
914
915 __br_multicast_enable_port(port);
916
917 out:
918 spin_unlock(&br->multicast_lock);
919 }
920
921 void br_multicast_disable_port(struct net_bridge_port *port)
922 {
923 struct net_bridge *br = port->br;
924 struct net_bridge_port_group *pg;
925 struct hlist_node *p, *n;
926
927 spin_lock(&br->multicast_lock);
928 hlist_for_each_entry_safe(pg, p, n, &port->mglist, mglist)
929 br_multicast_del_pg(br, pg);
930
931 if (!hlist_unhashed(&port->rlist))
932 hlist_del_init_rcu(&port->rlist);
933 del_timer(&port->multicast_router_timer);
934 del_timer(&port->multicast_query_timer);
935 spin_unlock(&br->multicast_lock);
936 }
937
938 static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
939 struct net_bridge_port *port,
940 struct sk_buff *skb)
941 {
942 struct igmpv3_report *ih;
943 struct igmpv3_grec *grec;
944 int i;
945 int len;
946 int num;
947 int type;
948 int err = 0;
949 __be32 group;
950
951 if (!pskb_may_pull(skb, sizeof(*ih)))
952 return -EINVAL;
953
954 ih = igmpv3_report_hdr(skb);
955 num = ntohs(ih->ngrec);
956 len = sizeof(*ih);
957
958 for (i = 0; i < num; i++) {
959 len += sizeof(*grec);
960 if (!pskb_may_pull(skb, len))
961 return -EINVAL;
962
963 grec = (void *)(skb->data + len - sizeof(*grec));
964 group = grec->grec_mca;
965 type = grec->grec_type;
966
967 len += ntohs(grec->grec_nsrcs) * 4;
968 if (!pskb_may_pull(skb, len))
969 return -EINVAL;
970
971 /* We treat this as an IGMPv2 report for now. */
972 switch (type) {
973 case IGMPV3_MODE_IS_INCLUDE:
974 case IGMPV3_MODE_IS_EXCLUDE:
975 case IGMPV3_CHANGE_TO_INCLUDE:
976 case IGMPV3_CHANGE_TO_EXCLUDE:
977 case IGMPV3_ALLOW_NEW_SOURCES:
978 case IGMPV3_BLOCK_OLD_SOURCES:
979 break;
980
981 default:
982 continue;
983 }
984
985 err = br_ip4_multicast_add_group(br, port, group);
986 if (err)
987 break;
988 }
989
990 return err;
991 }
992
993 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
994 static int br_ip6_multicast_mld2_report(struct net_bridge *br,
995 struct net_bridge_port *port,
996 struct sk_buff *skb)
997 {
998 struct icmp6hdr *icmp6h;
999 struct mld2_grec *grec;
1000 int i;
1001 int len;
1002 int num;
1003 int err = 0;
1004
1005 if (!pskb_may_pull(skb, sizeof(*icmp6h)))
1006 return -EINVAL;
1007
1008 icmp6h = icmp6_hdr(skb);
1009 num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
1010 len = sizeof(*icmp6h);
1011
1012 for (i = 0; i < num; i++) {
1013 __be16 *nsrcs, _nsrcs;
1014
1015 nsrcs = skb_header_pointer(skb,
1016 len + offsetof(struct mld2_grec,
1017 grec_mca),
1018 sizeof(_nsrcs), &_nsrcs);
1019 if (!nsrcs)
1020 return -EINVAL;
1021
1022 if (!pskb_may_pull(skb,
1023 len + sizeof(*grec) +
1024 sizeof(struct in6_addr) * (*nsrcs)))
1025 return -EINVAL;
1026
1027 grec = (struct mld2_grec *)(skb->data + len);
1028 len += sizeof(*grec) + sizeof(struct in6_addr) * (*nsrcs);
1029
1030 /* We treat these as MLDv1 reports for now. */
1031 switch (grec->grec_type) {
1032 case MLD2_MODE_IS_INCLUDE:
1033 case MLD2_MODE_IS_EXCLUDE:
1034 case MLD2_CHANGE_TO_INCLUDE:
1035 case MLD2_CHANGE_TO_EXCLUDE:
1036 case MLD2_ALLOW_NEW_SOURCES:
1037 case MLD2_BLOCK_OLD_SOURCES:
1038 break;
1039
1040 default:
1041 continue;
1042 }
1043
1044 err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
1045 if (!err)
1046 break;
1047 }
1048
1049 return err;
1050 }
1051 #endif
1052
1053 /*
1054 * Add port to rotuer_list
1055 * list is maintained ordered by pointer value
1056 * and locked by br->multicast_lock and RCU
1057 */
1058 static void br_multicast_add_router(struct net_bridge *br,
1059 struct net_bridge_port *port)
1060 {
1061 struct net_bridge_port *p;
1062 struct hlist_node *n, *slot = NULL;
1063
1064 hlist_for_each_entry(p, n, &br->router_list, rlist) {
1065 if ((unsigned long) port >= (unsigned long) p)
1066 break;
1067 slot = n;
1068 }
1069
1070 if (slot)
1071 hlist_add_after_rcu(slot, &port->rlist);
1072 else
1073 hlist_add_head_rcu(&port->rlist, &br->router_list);
1074 }
1075
1076 static void br_multicast_mark_router(struct net_bridge *br,
1077 struct net_bridge_port *port)
1078 {
1079 unsigned long now = jiffies;
1080
1081 if (!port) {
1082 if (br->multicast_router == 1)
1083 mod_timer(&br->multicast_router_timer,
1084 now + br->multicast_querier_interval);
1085 return;
1086 }
1087
1088 if (port->multicast_router != 1)
1089 return;
1090
1091 if (!hlist_unhashed(&port->rlist))
1092 goto timer;
1093
1094 br_multicast_add_router(br, port);
1095
1096 timer:
1097 mod_timer(&port->multicast_router_timer,
1098 now + br->multicast_querier_interval);
1099 }
1100
1101 static void br_multicast_query_received(struct net_bridge *br,
1102 struct net_bridge_port *port,
1103 int saddr)
1104 {
1105 if (saddr)
1106 mod_timer(&br->multicast_querier_timer,
1107 jiffies + br->multicast_querier_interval);
1108 else if (timer_pending(&br->multicast_querier_timer))
1109 return;
1110
1111 br_multicast_mark_router(br, port);
1112 }
1113
1114 static int br_ip4_multicast_query(struct net_bridge *br,
1115 struct net_bridge_port *port,
1116 struct sk_buff *skb)
1117 {
1118 struct iphdr *iph = ip_hdr(skb);
1119 struct igmphdr *ih = igmp_hdr(skb);
1120 struct net_bridge_mdb_entry *mp;
1121 struct igmpv3_query *ih3;
1122 struct net_bridge_port_group *p;
1123 struct net_bridge_port_group __rcu **pp;
1124 unsigned long max_delay;
1125 unsigned long now = jiffies;
1126 __be32 group;
1127 int err = 0;
1128
1129 spin_lock(&br->multicast_lock);
1130 if (!netif_running(br->dev) ||
1131 (port && port->state == BR_STATE_DISABLED))
1132 goto out;
1133
1134 br_multicast_query_received(br, port, !!iph->saddr);
1135
1136 group = ih->group;
1137
1138 if (skb->len == sizeof(*ih)) {
1139 max_delay = ih->code * (HZ / IGMP_TIMER_SCALE);
1140
1141 if (!max_delay) {
1142 max_delay = 10 * HZ;
1143 group = 0;
1144 }
1145 } else {
1146 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) {
1147 err = -EINVAL;
1148 goto out;
1149 }
1150
1151 ih3 = igmpv3_query_hdr(skb);
1152 if (ih3->nsrcs)
1153 goto out;
1154
1155 max_delay = ih3->code ?
1156 IGMPV3_MRC(ih3->code) * (HZ / IGMP_TIMER_SCALE) : 1;
1157 }
1158
1159 if (!group)
1160 goto out;
1161
1162 mp = br_mdb_ip4_get(mlock_dereference(br->mdb, br), group);
1163 if (!mp)
1164 goto out;
1165
1166 max_delay *= br->multicast_last_member_count;
1167
1168 if (!hlist_unhashed(&mp->mglist) &&
1169 (timer_pending(&mp->timer) ?
1170 time_after(mp->timer.expires, now + max_delay) :
1171 try_to_del_timer_sync(&mp->timer) >= 0))
1172 mod_timer(&mp->timer, now + max_delay);
1173
1174 for (pp = &mp->ports;
1175 (p = mlock_dereference(*pp, br)) != NULL;
1176 pp = &p->next) {
1177 if (timer_pending(&p->timer) ?
1178 time_after(p->timer.expires, now + max_delay) :
1179 try_to_del_timer_sync(&p->timer) >= 0)
1180 mod_timer(&mp->timer, now + max_delay);
1181 }
1182
1183 out:
1184 spin_unlock(&br->multicast_lock);
1185 return err;
1186 }
1187
1188 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1189 static int br_ip6_multicast_query(struct net_bridge *br,
1190 struct net_bridge_port *port,
1191 struct sk_buff *skb)
1192 {
1193 struct ipv6hdr *ip6h = ipv6_hdr(skb);
1194 struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
1195 struct net_bridge_mdb_entry *mp;
1196 struct mld2_query *mld2q;
1197 struct net_bridge_port_group *p;
1198 struct net_bridge_port_group __rcu **pp;
1199 unsigned long max_delay;
1200 unsigned long now = jiffies;
1201 struct in6_addr *group = NULL;
1202 int err = 0;
1203
1204 spin_lock(&br->multicast_lock);
1205 if (!netif_running(br->dev) ||
1206 (port && port->state == BR_STATE_DISABLED))
1207 goto out;
1208
1209 br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
1210
1211 if (skb->len == sizeof(*mld)) {
1212 if (!pskb_may_pull(skb, sizeof(*mld))) {
1213 err = -EINVAL;
1214 goto out;
1215 }
1216 mld = (struct mld_msg *) icmp6_hdr(skb);
1217 max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay));
1218 if (max_delay)
1219 group = &mld->mld_mca;
1220 } else if (skb->len >= sizeof(*mld2q)) {
1221 if (!pskb_may_pull(skb, sizeof(*mld2q))) {
1222 err = -EINVAL;
1223 goto out;
1224 }
1225 mld2q = (struct mld2_query *)icmp6_hdr(skb);
1226 if (!mld2q->mld2q_nsrcs)
1227 group = &mld2q->mld2q_mca;
1228 max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
1229 }
1230
1231 if (!group)
1232 goto out;
1233
1234 mp = br_mdb_ip6_get(mlock_dereference(br->mdb, br), group);
1235 if (!mp)
1236 goto out;
1237
1238 max_delay *= br->multicast_last_member_count;
1239 if (!hlist_unhashed(&mp->mglist) &&
1240 (timer_pending(&mp->timer) ?
1241 time_after(mp->timer.expires, now + max_delay) :
1242 try_to_del_timer_sync(&mp->timer) >= 0))
1243 mod_timer(&mp->timer, now + max_delay);
1244
1245 for (pp = &mp->ports;
1246 (p = mlock_dereference(*pp, br)) != NULL;
1247 pp = &p->next) {
1248 if (timer_pending(&p->timer) ?
1249 time_after(p->timer.expires, now + max_delay) :
1250 try_to_del_timer_sync(&p->timer) >= 0)
1251 mod_timer(&mp->timer, now + max_delay);
1252 }
1253
1254 out:
1255 spin_unlock(&br->multicast_lock);
1256 return err;
1257 }
1258 #endif
1259
1260 static void br_multicast_leave_group(struct net_bridge *br,
1261 struct net_bridge_port *port,
1262 struct br_ip *group)
1263 {
1264 struct net_bridge_mdb_htable *mdb;
1265 struct net_bridge_mdb_entry *mp;
1266 struct net_bridge_port_group *p;
1267 unsigned long now;
1268 unsigned long time;
1269
1270 spin_lock(&br->multicast_lock);
1271 if (!netif_running(br->dev) ||
1272 (port && port->state == BR_STATE_DISABLED) ||
1273 timer_pending(&br->multicast_querier_timer))
1274 goto out;
1275
1276 mdb = mlock_dereference(br->mdb, br);
1277 mp = br_mdb_ip_get(mdb, group);
1278 if (!mp)
1279 goto out;
1280
1281 now = jiffies;
1282 time = now + br->multicast_last_member_count *
1283 br->multicast_last_member_interval;
1284
1285 if (!port) {
1286 if (!hlist_unhashed(&mp->mglist) &&
1287 (timer_pending(&mp->timer) ?
1288 time_after(mp->timer.expires, time) :
1289 try_to_del_timer_sync(&mp->timer) >= 0)) {
1290 mod_timer(&mp->timer, time);
1291
1292 mp->queries_sent = 0;
1293 mod_timer(&mp->query_timer, now);
1294 }
1295
1296 goto out;
1297 }
1298
1299 for (p = mlock_dereference(mp->ports, br);
1300 p != NULL;
1301 p = mlock_dereference(p->next, br)) {
1302 if (p->port != port)
1303 continue;
1304
1305 if (!hlist_unhashed(&p->mglist) &&
1306 (timer_pending(&p->timer) ?
1307 time_after(p->timer.expires, time) :
1308 try_to_del_timer_sync(&p->timer) >= 0)) {
1309 mod_timer(&p->timer, time);
1310
1311 p->queries_sent = 0;
1312 mod_timer(&p->query_timer, now);
1313 }
1314
1315 break;
1316 }
1317
1318 out:
1319 spin_unlock(&br->multicast_lock);
1320 }
1321
1322 static void br_ip4_multicast_leave_group(struct net_bridge *br,
1323 struct net_bridge_port *port,
1324 __be32 group)
1325 {
1326 struct br_ip br_group;
1327
1328 if (ipv4_is_local_multicast(group))
1329 return;
1330
1331 br_group.u.ip4 = group;
1332 br_group.proto = htons(ETH_P_IP);
1333
1334 br_multicast_leave_group(br, port, &br_group);
1335 }
1336
1337 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1338 static void br_ip6_multicast_leave_group(struct net_bridge *br,
1339 struct net_bridge_port *port,
1340 const struct in6_addr *group)
1341 {
1342 struct br_ip br_group;
1343
1344 if (ipv6_is_local_multicast(group))
1345 return;
1346
1347 ipv6_addr_copy(&br_group.u.ip6, group);
1348 br_group.proto = htons(ETH_P_IPV6);
1349
1350 br_multicast_leave_group(br, port, &br_group);
1351 }
1352 #endif
1353
1354 static int br_multicast_ipv4_rcv(struct net_bridge *br,
1355 struct net_bridge_port *port,
1356 struct sk_buff *skb)
1357 {
1358 struct sk_buff *skb2 = skb;
1359 struct iphdr *iph;
1360 struct igmphdr *ih;
1361 unsigned len;
1362 unsigned offset;
1363 int err;
1364
1365 /* We treat OOM as packet loss for now. */
1366 if (!pskb_may_pull(skb, sizeof(*iph)))
1367 return -EINVAL;
1368
1369 iph = ip_hdr(skb);
1370
1371 if (iph->ihl < 5 || iph->version != 4)
1372 return -EINVAL;
1373
1374 if (!pskb_may_pull(skb, ip_hdrlen(skb)))
1375 return -EINVAL;
1376
1377 iph = ip_hdr(skb);
1378
1379 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1380 return -EINVAL;
1381
1382 if (iph->protocol != IPPROTO_IGMP)
1383 return 0;
1384
1385 len = ntohs(iph->tot_len);
1386 if (skb->len < len || len < ip_hdrlen(skb))
1387 return -EINVAL;
1388
1389 if (skb->len > len) {
1390 skb2 = skb_clone(skb, GFP_ATOMIC);
1391 if (!skb2)
1392 return -ENOMEM;
1393
1394 err = pskb_trim_rcsum(skb2, len);
1395 if (err)
1396 goto err_out;
1397 }
1398
1399 len -= ip_hdrlen(skb2);
1400 offset = skb_network_offset(skb2) + ip_hdrlen(skb2);
1401 __skb_pull(skb2, offset);
1402 skb_reset_transport_header(skb2);
1403
1404 err = -EINVAL;
1405 if (!pskb_may_pull(skb2, sizeof(*ih)))
1406 goto out;
1407
1408 switch (skb2->ip_summed) {
1409 case CHECKSUM_COMPLETE:
1410 if (!csum_fold(skb2->csum))
1411 break;
1412 /* fall through */
1413 case CHECKSUM_NONE:
1414 skb2->csum = 0;
1415 if (skb_checksum_complete(skb2))
1416 goto out;
1417 }
1418
1419 err = 0;
1420
1421 BR_INPUT_SKB_CB(skb)->igmp = 1;
1422 ih = igmp_hdr(skb2);
1423
1424 switch (ih->type) {
1425 case IGMP_HOST_MEMBERSHIP_REPORT:
1426 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1427 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1428 err = br_ip4_multicast_add_group(br, port, ih->group);
1429 break;
1430 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1431 err = br_ip4_multicast_igmp3_report(br, port, skb2);
1432 break;
1433 case IGMP_HOST_MEMBERSHIP_QUERY:
1434 err = br_ip4_multicast_query(br, port, skb2);
1435 break;
1436 case IGMP_HOST_LEAVE_MESSAGE:
1437 br_ip4_multicast_leave_group(br, port, ih->group);
1438 break;
1439 }
1440
1441 out:
1442 __skb_push(skb2, offset);
1443 err_out:
1444 if (skb2 != skb)
1445 kfree_skb(skb2);
1446 return err;
1447 }
1448
1449 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1450 static int br_multicast_ipv6_rcv(struct net_bridge *br,
1451 struct net_bridge_port *port,
1452 struct sk_buff *skb)
1453 {
1454 struct sk_buff *skb2;
1455 struct ipv6hdr *ip6h;
1456 struct icmp6hdr *icmp6h;
1457 u8 nexthdr;
1458 unsigned len;
1459 int offset;
1460 int err;
1461
1462 if (!pskb_may_pull(skb, sizeof(*ip6h)))
1463 return -EINVAL;
1464
1465 ip6h = ipv6_hdr(skb);
1466
1467 /*
1468 * We're interested in MLD messages only.
1469 * - Version is 6
1470 * - MLD has always Router Alert hop-by-hop option
1471 * - But we do not support jumbrograms.
1472 */
1473 if (ip6h->version != 6 ||
1474 ip6h->nexthdr != IPPROTO_HOPOPTS ||
1475 ip6h->payload_len == 0)
1476 return 0;
1477
1478 len = ntohs(ip6h->payload_len);
1479 if (skb->len < len)
1480 return -EINVAL;
1481
1482 nexthdr = ip6h->nexthdr;
1483 offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr);
1484
1485 if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
1486 return 0;
1487
1488 /* Okay, we found ICMPv6 header */
1489 skb2 = skb_clone(skb, GFP_ATOMIC);
1490 if (!skb2)
1491 return -ENOMEM;
1492
1493 err = -EINVAL;
1494 if (!pskb_may_pull(skb2, offset + sizeof(struct icmp6hdr)))
1495 goto out;
1496
1497 len -= offset - skb_network_offset(skb2);
1498
1499 __skb_pull(skb2, offset);
1500 skb_reset_transport_header(skb2);
1501
1502 icmp6h = icmp6_hdr(skb2);
1503
1504 switch (icmp6h->icmp6_type) {
1505 case ICMPV6_MGM_QUERY:
1506 case ICMPV6_MGM_REPORT:
1507 case ICMPV6_MGM_REDUCTION:
1508 case ICMPV6_MLD2_REPORT:
1509 break;
1510 default:
1511 err = 0;
1512 goto out;
1513 }
1514
1515 /* Okay, we found MLD message. Check further. */
1516 if (skb2->len > len) {
1517 err = pskb_trim_rcsum(skb2, len);
1518 if (err)
1519 goto out;
1520 }
1521
1522 switch (skb2->ip_summed) {
1523 case CHECKSUM_COMPLETE:
1524 if (!csum_fold(skb2->csum))
1525 break;
1526 /*FALLTHROUGH*/
1527 case CHECKSUM_NONE:
1528 skb2->csum = 0;
1529 if (skb_checksum_complete(skb2))
1530 goto out;
1531 }
1532
1533 err = 0;
1534
1535 BR_INPUT_SKB_CB(skb)->igmp = 1;
1536
1537 switch (icmp6h->icmp6_type) {
1538 case ICMPV6_MGM_REPORT:
1539 {
1540 struct mld_msg *mld;
1541 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1542 err = -EINVAL;
1543 goto out;
1544 }
1545 mld = (struct mld_msg *)skb_transport_header(skb2);
1546 BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
1547 err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
1548 break;
1549 }
1550 case ICMPV6_MLD2_REPORT:
1551 err = br_ip6_multicast_mld2_report(br, port, skb2);
1552 break;
1553 case ICMPV6_MGM_QUERY:
1554 err = br_ip6_multicast_query(br, port, skb2);
1555 break;
1556 case ICMPV6_MGM_REDUCTION:
1557 {
1558 struct mld_msg *mld;
1559 if (!pskb_may_pull(skb2, sizeof(*mld))) {
1560 err = -EINVAL;
1561 goto out;
1562 }
1563 mld = (struct mld_msg *)skb_transport_header(skb2);
1564 br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
1565 }
1566 }
1567
1568 out:
1569 kfree_skb(skb2);
1570 return err;
1571 }
1572 #endif
1573
1574 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
1575 struct sk_buff *skb)
1576 {
1577 BR_INPUT_SKB_CB(skb)->igmp = 0;
1578 BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
1579
1580 if (br->multicast_disabled)
1581 return 0;
1582
1583 switch (skb->protocol) {
1584 case htons(ETH_P_IP):
1585 return br_multicast_ipv4_rcv(br, port, skb);
1586 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1587 case htons(ETH_P_IPV6):
1588 return br_multicast_ipv6_rcv(br, port, skb);
1589 #endif
1590 }
1591
1592 return 0;
1593 }
1594
1595 static void br_multicast_query_expired(unsigned long data)
1596 {
1597 struct net_bridge *br = (void *)data;
1598
1599 spin_lock(&br->multicast_lock);
1600 if (br->multicast_startup_queries_sent <
1601 br->multicast_startup_query_count)
1602 br->multicast_startup_queries_sent++;
1603
1604 br_multicast_send_query(br, NULL, br->multicast_startup_queries_sent);
1605
1606 spin_unlock(&br->multicast_lock);
1607 }
1608
1609 void br_multicast_init(struct net_bridge *br)
1610 {
1611 br->hash_elasticity = 4;
1612 br->hash_max = 512;
1613
1614 br->multicast_router = 1;
1615 br->multicast_last_member_count = 2;
1616 br->multicast_startup_query_count = 2;
1617
1618 br->multicast_last_member_interval = HZ;
1619 br->multicast_query_response_interval = 10 * HZ;
1620 br->multicast_startup_query_interval = 125 * HZ / 4;
1621 br->multicast_query_interval = 125 * HZ;
1622 br->multicast_querier_interval = 255 * HZ;
1623 br->multicast_membership_interval = 260 * HZ;
1624
1625 spin_lock_init(&br->multicast_lock);
1626 setup_timer(&br->multicast_router_timer,
1627 br_multicast_local_router_expired, 0);
1628 setup_timer(&br->multicast_querier_timer,
1629 br_multicast_local_router_expired, 0);
1630 setup_timer(&br->multicast_query_timer, br_multicast_query_expired,
1631 (unsigned long)br);
1632 }
1633
1634 void br_multicast_open(struct net_bridge *br)
1635 {
1636 br->multicast_startup_queries_sent = 0;
1637
1638 if (br->multicast_disabled)
1639 return;
1640
1641 mod_timer(&br->multicast_query_timer, jiffies);
1642 }
1643
1644 void br_multicast_stop(struct net_bridge *br)
1645 {
1646 struct net_bridge_mdb_htable *mdb;
1647 struct net_bridge_mdb_entry *mp;
1648 struct hlist_node *p, *n;
1649 u32 ver;
1650 int i;
1651
1652 del_timer_sync(&br->multicast_router_timer);
1653 del_timer_sync(&br->multicast_querier_timer);
1654 del_timer_sync(&br->multicast_query_timer);
1655
1656 spin_lock_bh(&br->multicast_lock);
1657 mdb = mlock_dereference(br->mdb, br);
1658 if (!mdb)
1659 goto out;
1660
1661 br->mdb = NULL;
1662
1663 ver = mdb->ver;
1664 for (i = 0; i < mdb->max; i++) {
1665 hlist_for_each_entry_safe(mp, p, n, &mdb->mhash[i],
1666 hlist[ver]) {
1667 del_timer(&mp->timer);
1668 del_timer(&mp->query_timer);
1669 call_rcu_bh(&mp->rcu, br_multicast_free_group);
1670 }
1671 }
1672
1673 if (mdb->old) {
1674 spin_unlock_bh(&br->multicast_lock);
1675 rcu_barrier_bh();
1676 spin_lock_bh(&br->multicast_lock);
1677 WARN_ON(mdb->old);
1678 }
1679
1680 mdb->old = mdb;
1681 call_rcu_bh(&mdb->rcu, br_mdb_free);
1682
1683 out:
1684 spin_unlock_bh(&br->multicast_lock);
1685 }
1686
1687 int br_multicast_set_router(struct net_bridge *br, unsigned long val)
1688 {
1689 int err = -ENOENT;
1690
1691 spin_lock_bh(&br->multicast_lock);
1692 if (!netif_running(br->dev))
1693 goto unlock;
1694
1695 switch (val) {
1696 case 0:
1697 case 2:
1698 del_timer(&br->multicast_router_timer);
1699 /* fall through */
1700 case 1:
1701 br->multicast_router = val;
1702 err = 0;
1703 break;
1704
1705 default:
1706 err = -EINVAL;
1707 break;
1708 }
1709
1710 unlock:
1711 spin_unlock_bh(&br->multicast_lock);
1712
1713 return err;
1714 }
1715
1716 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val)
1717 {
1718 struct net_bridge *br = p->br;
1719 int err = -ENOENT;
1720
1721 spin_lock(&br->multicast_lock);
1722 if (!netif_running(br->dev) || p->state == BR_STATE_DISABLED)
1723 goto unlock;
1724
1725 switch (val) {
1726 case 0:
1727 case 1:
1728 case 2:
1729 p->multicast_router = val;
1730 err = 0;
1731
1732 if (val < 2 && !hlist_unhashed(&p->rlist))
1733 hlist_del_init_rcu(&p->rlist);
1734
1735 if (val == 1)
1736 break;
1737
1738 del_timer(&p->multicast_router_timer);
1739
1740 if (val == 0)
1741 break;
1742
1743 br_multicast_add_router(br, p);
1744 break;
1745
1746 default:
1747 err = -EINVAL;
1748 break;
1749 }
1750
1751 unlock:
1752 spin_unlock(&br->multicast_lock);
1753
1754 return err;
1755 }
1756
1757 int br_multicast_toggle(struct net_bridge *br, unsigned long val)
1758 {
1759 struct net_bridge_port *port;
1760 int err = 0;
1761 struct net_bridge_mdb_htable *mdb;
1762
1763 spin_lock(&br->multicast_lock);
1764 if (br->multicast_disabled == !val)
1765 goto unlock;
1766
1767 br->multicast_disabled = !val;
1768 if (br->multicast_disabled)
1769 goto unlock;
1770
1771 if (!netif_running(br->dev))
1772 goto unlock;
1773
1774 mdb = mlock_dereference(br->mdb, br);
1775 if (mdb) {
1776 if (mdb->old) {
1777 err = -EEXIST;
1778 rollback:
1779 br->multicast_disabled = !!val;
1780 goto unlock;
1781 }
1782
1783 err = br_mdb_rehash(&br->mdb, mdb->max,
1784 br->hash_elasticity);
1785 if (err)
1786 goto rollback;
1787 }
1788
1789 br_multicast_open(br);
1790 list_for_each_entry(port, &br->port_list, list) {
1791 if (port->state == BR_STATE_DISABLED ||
1792 port->state == BR_STATE_BLOCKING)
1793 continue;
1794
1795 __br_multicast_enable_port(port);
1796 }
1797
1798 unlock:
1799 spin_unlock(&br->multicast_lock);
1800
1801 return err;
1802 }
1803
1804 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val)
1805 {
1806 int err = -ENOENT;
1807 u32 old;
1808 struct net_bridge_mdb_htable *mdb;
1809
1810 spin_lock(&br->multicast_lock);
1811 if (!netif_running(br->dev))
1812 goto unlock;
1813
1814 err = -EINVAL;
1815 if (!is_power_of_2(val))
1816 goto unlock;
1817
1818 mdb = mlock_dereference(br->mdb, br);
1819 if (mdb && val < mdb->size)
1820 goto unlock;
1821
1822 err = 0;
1823
1824 old = br->hash_max;
1825 br->hash_max = val;
1826
1827 if (mdb) {
1828 if (mdb->old) {
1829 err = -EEXIST;
1830 rollback:
1831 br->hash_max = old;
1832 goto unlock;
1833 }
1834
1835 err = br_mdb_rehash(&br->mdb, br->hash_max,
1836 br->hash_elasticity);
1837 if (err)
1838 goto rollback;
1839 }
1840
1841 unlock:
1842 spin_unlock(&br->multicast_lock);
1843
1844 return err;
1845 }
CRIS linux kernel tree